梁端削弱对模块化栓焊混合节点滞回性能的影响

Influence of beam end weakening on the hysteresis performance of modular bolted-welded hybrid joints

为了揭示不同梁端截面削弱构造对模块化栓焊混合连接节点抗震性能的影响规律,利用ABAQUS软件建立14个具有梁端截面削弱构造的新型梁柱节点模型,通过试验和参数分析验证节点有限元模型的合理性。研究表明:翼缘和腹板分别单独削弱时,能够减小核心模块和柱端钢骨的应力,增大翼缘连接板处的应力集中。“梁端翼缘+腹板”同时削弱时,能够在梁端削弱截面位置处形成塑性铰,显著减小核心区模块的应力集中和翼缘连接板处的损伤,减小节点的整体变形并提高其耗能能力。研究结论为新型模块化栓焊混合连接节点的工程设计和应用提供理论支撑。

To reveal the influence of different beam end section weakening structures on the seismic performance of modular bolted welded hybrid connection joints(MHCJs),14 MHCJs models with beam end section weakening were established by using ABAQUS and parameter analysis was conducted.The rationality of the finite element model of the joint was verified by experiments and parameter analysis.The results indicate that when the flange and web are separately weakened,it helps to reduce the stress distribution of the core module(CM)and column end steel skeleton,but increases the stress concentration phenomenon of the flange connection plate(FCP).When the flange and web of the beam end are simultaneously weakened,plastic hinges can be formed at the weakened section position of the beam end,significantly reducing the stress concentration of the CM and the damage at the FCP,improving the overall deformation and energy dissipation capacity.The research results provide theoretical support and basis for the engineering design and application of new MHCJs.